Do not use Spanning Tree Protocol (STP) or use PortFast
Do not use STP on switch ports that connect to iSCSI initiators or the Nimble storage array network interfaces.
Configure flow control on each switch port
Configure Flow Control on each switch port that handles iSCSI connections. If your application server is using a software iSCSI initiator and NIC combination to handle iSCSI traffic, you must also enable Flow Control on the NICs to obtain the performance benefit.
Disable unicast storm control
Disable unicast storm control on each switch that handles iSCSI traffic. However, the use of broadcast and multicast storm control is encouraged.